I need to Create a chat messenger(either window base/Web Based or mobile)

This question has been moved from Career Advice section to Forums------------------------------------------------------------------------------------------Hello Sir, thanx for your career advice.that helped me a lot . Sir I need to Create a chat messenger(either window base/Web Based or mobile). Can i create It using Asp.net or C#. reffer me some guidense or Any Website that can help me.N what technologies it requirs...